Muzan Kibutsuji is the king of demons and uses his time wisely. He can turn a human into a demon with the slightest scratch of his demon nails by injecting his blood into a human. Muzan has black wavy hair with lavender eyes. As a demon he can't be out in the day. He is working on a way to conquer the sun and be able to walk out even in the day. Muzan is cold and ruthless, but he still holds some form of morals.